Dred Scott, a slave, had been taken to Illinois, a free state, and then Wisconsin territory, where the Missouri Compromise of 1820 prohibited slavery.
<span>People in north refused to allow escaped slaves to live in their states
For the north states were against slavery, and known as 'Free states'
hope this helps</span>
Were built around a common is the correct answer I believe.
Because it can be very reliable
South carolina and north carolina